http://tessource.net/files/file.php?id=8516
For those who haven't seen it before, it's a utility for dumping Arena's resource files to more accessible file formats. Most of the formats have been figured out, with the noteable exception of the IMG format used for full-screen images. Now if only I could find an Arena-era dev who could give me a few hints how that format was encoded...
It also allows you to wonder around the starter dungeon and see what Arena would have looked like had it supported 640x400 or 960x600 resolutions, still using the same 8-bit graphics and pixel dithering scheme as Arena.